GB/T 6529-2008 English PDF (GBT6529-2008)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 6529-2008
Historical versions: GB/T 6529-2008
Preview True-PDF (Reload/Scroll if blank)

GB/T 6529-2008: Textiles -- Standard atmospheres for conditioning and testing
GB/T 6529-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
W 04
Replacing GB 6529-1986
Textiles - Standard atmospheres for conditioning and
testing
(ISO 139:2005, MOD)
ISSUED ON: JUNE 18, 2008
IMPLEMENTED ON: MARCH 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Terms and definitions ... 5 
3 Requirements ... 6 
4 Instruments ... 6 
5 Procedure ... 7 
6 Test report ... 8 
Appendix A (Normative) Control of standard atmosphere ... 9 
Appendix B (Informative) Tolerance zone ... 10 
Appendix C (Informative) Relative humidity comparison table ... 12 
Foreword
This Standard modifies and adopts ISO 139:2005, Textiles - Standard
atmospheres for conditioning and testing (English version).
This Standard is redrafted according to ISO 139:2005; the differences from ISO
139:2005 are:
1. Put the main content of the ISO introduction into Appendix B in the form of
notes.
2. In accordance with the draft amendment of ISO 139:2005 DAmd 1.2, add the
term 2.8 “rapid conditioning” to Chapter 2; add the stipulation for 3.2.2
"tropical standard atmosphere" in 3.2; adjust the numbers of this chapter.
3. Replace the international standards which are cited in ISO 139:2005 with
corresponding national standards.
4. Add informative Appendix C to guide the use.
This Standard replaces GB 6529-1986, Standard atmospheres for textiles
conditioning and testing. This Standard makes the following major changes to
GB 6529-1986:
1. Change it from a mandatory standard to a recommended standard.
2. Delete 3 definitions in Chapter 2; add 6 definitions that are related to the
content of the new standard.
3. Adjust the chapters of the standard; modify the technical contents; add
contents to Chapter 3 "Requirements" and Chapter 4 "Instrument".
4. Modify the two originally specified atmospheric conditions of “temperate zone
standard atmosphere” (temperature of 20 °C, relative humidity of 65%) and
“tropical standard atmosphere” (temperature of 27 °C, relative humidity of
65%) to: “standard atmosphere” (temperature of 20 °C, relative humidity of
65.0%) and “optional standard atmosphere” (temperature of 23 °C, relative
humidity of 50.0%; or temperature of 27 °C, relative humidity of 65.0%).
5. Modify the tolerance zone of relative humidity; modify the tolerance zone of
relative humidity under all atmospheric conditions to ±4.0%.
6. Delete Appendix A and Appendix C of GB 6529-2986.
7. Simply the original Appendix B, to be Appendix C of this Standard.
Textiles - Standard atmospheres for conditioning and
testing
1 Scope
This Standard specifies the characteristics and use of the standard atmosphere
for textiles during the conditioning and determination of physical-mechanical
properties, as well as the characteristics and use of the optional standard
atmosphere when the relevant parties agree.
2 Terms and definitions
The following terms and definitions are applicable to this Standard.
2.1 Standard atmosphere
An environment where relative humidity and temperature are controlled; textiles
are subjected to conditioning and testing under this environmental temperature
and humidity.
2.2 Relative humidity
Under the same temperature and pressure conditions, the ratio of the actual
pressure of water vapor in the atmosphere to the pressure of saturated water
vapor, which is expressed in percentages.
2.3 Tolerance
The difference between the upper tolerance limit value and the lower tolerance
limit value.
2.4 Tolerance zone
The variation value whose characteristic is between the tolerance limits,
including the tolerance limits.
2.5 Tolerance limits
The specified value of the upper limit and/or lower limit of the given allowable
value.
2.6 Uncertainty of measurement
The measuring device shall meet the following requirements:
-- Resolution: temperature ≤0.1 °C, relative humidity ≤0.1%.
-- Uncertainty of measurement: the temperature does not exceed ±0.5 °C;
the relative humidity does not exceed ±2.0%.
4.2 Environmental requirements of the measuring device
In the conditioned atmosphere, the devices that are used to determine relative
humidity and temperature shall be separated from the devices which are usually
used for controlled heating, conditioning and air conditioning pipes.
5 Procedure
5.1 Determine the reading frequency of continuous monitoring
The determination of the monitoring frequency of the reading sensor that
controls the atmosphere shall ensure that any situation that exceeds the
tolerance limits within a short period of time can be monitored (see Appendix A
for additional instructions).
5.2 Monitor the atmosphere at different locations
In order to ensure sufficient atmospheric conditions to monitor the entire
enclosed environment, multiple measurement devices shall be installed (see
Appendix A).
5.3 Preconditioning
Textiles shall be preconditioned before the conditioning. If necessary, textiles
shall be placed under the atmospheric condition where the relative humidity is
10.0% ~ 25.0%, and the temperature is not more than 50.0 °C, to make them
close to equilibrium.
5.4 Conditioning
Before the test, the textiles shall be placed in a standard atmospheric
environment for conditioning. During the conditioning period, air shall be able
to flow through the textile smoothly. Place the textile in the atmospheric
environment for the required time, until equilibrium.
Unless otherwise specified, when the weight progressive variable of textiles
does not exceed 0.25%, it is regarded to be in the equilibrium state. When the
conditioning is performed in a laboratory of standard atmospheric environment,
the continuous weighing interval of textiles is 2 h; when rapid conditioning is
used, the continuous weighing interval of textiles is 2 min ~ 10 min.
Appendix A 
(Normative) 
Control of standard atmosphere 
A.1 General
The constant temperature and humidity laboratory shall be able to provide and
maintain the standard atmosphere that is specified in 3.1 and 3.2; its tolerance
zone shall be in accordance with the provisions of 3.3.
When the following conditions are met, it’s considered that the temperature and
relative humidity have reached the specified conditions:
a) Temperature and relative humidity meet the tolerance zone of standard
atmospheric conditions for at least 1 hour continuously;
b) The change of standard atmosphere at different locations shall meet the
specified tolerance zone.
A.2 Apparatus
The apparatus shall meet the requirements of 4.1; it shall have a sensor for
continuous monitoring, and an appropriate device that is capable of outputting
records.
A.3 Procedure
A.3.1 Monitor the atmosphere at different locations
It shall periodically monitor the changes in atmospheric conditions at different
points in the laboratory; there shall be no less than one monitoring point within
50 m3.
If the atmospheric changes at different locations do not meet the tolerance, the
air flow in the laboratory shall be checked.
A.3.2 Placement of continuous monitoring device
Changes in temperature and relative humidity may exist in the entire work area;
the selected monitoring location shall be close to the main work area. After the ...